I bought this knife because it is a Twosun and it’s N690 with titanium scale on the working side. Unfortunately, the action is very rough so I disassembled it only to find out that the ceramic bearings were a size smaller than it should be making the blade rub against the scales. I had to put washers on both sides of the blade to allow the bearings to roll on the racetrack. If you are not keen on troubleshooting these issues please stay away from this particular model.